Adam C Carroll, Aaron R Grubbs, Anton K Schindler, Robert W Barnes
Aggregate gradation, Compressive strength, concrete, Cores (Specimens), Diameter, Test procedures
To evaluate the in-place concrete strength for acceptance for a structural member with potentially substandard strength, the compressive strength of cores may be required for assessment. Depending on the geometry and size of the core specimen, the compressive test results may need adjustment to characterize the in-place concrete strength. The comprehensive experimental study performed examines core test results for factors including: three targeted strengths (6,000, 8,000, and 10,000 psi), two coarse aggregate sizes (No. 67 and 57), five core length-to-diameters (1.0, 1.25, 1.5, 1.75, and 2.0), two core diameter sizes (3 and 4 in.), and two coring directions (parallel and perpendicular). The data represent 390 core specimens obtained from 12 separate concrete castings.